Turkeys, quail, pheasants, as well as some rare jungle fowls that I dont remember the names of have all hybridized with chickens. I have heard Silver Pheasants and chicken hybrids are quite fertile. I dont know much about ducks. You may find this interesting: http://www.feathersite.com/Poultry/BRKHybrids.html
Ive heard of these crosses:
Domestic Duck(Mallard descendant)-Muscovy Duck. I have had some of those before.
Cat-Rabbit. Seen one before
Horse-Donkey. Seen one before
Dog-Coyote. Seen some before, Nasty buggers!
There are MANY hybrids out there, but those are the ones I can think of right now.
How does that work? They aren't close enough relation to hybridize I thought?
Dog-wolf is another common hybrid. Nasty mix.
I disagree with you on wolf dog mixes being nasty. I have known a few and they were very nice animals. But they are not for everyone. Cat rabbit cross was a joke/scam years ago. It is impossible. They called them 'cabbits'. It is really just a cat with a genetic defect, causing the leg bones to look similar to a rabbits.
A wolf hybrid is still at heart a wolf, and were HUGE in one place we lived. I carried a .45 pistol with me at all times because more than once we were challenged by one who was unrestrained. I refuse to call them nice pets.
They may be decent for a wild animal. But they are not a pet to me, nor will they ever be. I've met a coyote hybrid who was far more civil than any of the wolf hybrids I met. Granted, he won that because he was shy and wouldn't try to challenge a person first, and I never tried to challenge him, so he was likely still a coyote if you challenged him.
I agree they are not 'pets' in the sense that a dog or cat is. They are also not for most people. But not all are aggressive. But just because they are not a pet to you does not mean they can not be a pet to someone else.